We are spending 2 weeks with my boyfriends family in Denmark and Sweden. I having a hard time planning because I’m not sure what there planning for us . They live within a 45 min train ride of Copenhagen. We will be staying with them most of the time. I know we are going to Sweden to visit there summer home and will go to Stockholm for 2 days from there. We probably have room for 1 overnight trip to Aero or Bornholm? I’m thinking. Any recs would be appreciated.
Hang back and let your hosts make your travel plans. You don't want to step on any toes.
In the meantime, you might want to get Rick Steve's guide on the area where you'll be more knowledgeable about Denmark and Sweden. Wikipedia's another great place to read online.
I agree with reading up on your options in advance, but there's probably nothing that really must be decided or reserved ahead.